A connection to the Cloud Pub/Sub service to receive events.
This interface defines pure-virtual functions for each of the user-facing overload sets in Subscriber. That is, all of Subscriber's overloads will forward to the one pure-virtual function declared in this interface. This allows users to inject custom behavior (e.g., with a Google Mock object) in a Subscriber object for use in their own tests.
To create a concrete instance that connects you to the real Cloud Pub/Sub service, see MakeSubscriberConnection().
The *Params nested classes
Applications may define classes derived from SubscriberConnection, for example, because they want to mock the class. To avoid breaking all such derived classes when we change the number or type of the arguments to the member functions we define lightweight structures to pass the arguments.
Functions
virtual Subscribe(SubscribeParams)
Defines the interface for Subscriber::Subscribe(ApplicationCallback)
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["\u003cp\u003eThis webpage details the \u003ccode\u003eSubscriberConnection\u003c/code\u003e class for connecting to the Cloud Pub/Sub service to receive events.\u003c/p\u003e\n"],["\u003cp\u003eThe latest release of the \u003ccode\u003eSubscriberConnection\u003c/code\u003e documentation is version 2.37.0-rc, with multiple prior versions available for reference, dating back to 2.11.0.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eSubscriberConnection\u003c/code\u003e defines pure-virtual functions corresponding to the user-facing overloads in the \u003ccode\u003eSubscriber\u003c/code\u003e class, enabling the injection of custom behavior for testing.\u003c/p\u003e\n"],["\u003cp\u003eThe page outlines the functions available within \u003ccode\u003eSubscriberConnection\u003c/code\u003e, including \u003ccode\u003eSubscribe\u003c/code\u003e, \u003ccode\u003eExactlyOnceSubscribe\u003c/code\u003e, \u003ccode\u003ePull\u003c/code\u003e, and \u003ccode\u003eoptions\u003c/code\u003e, along with their respective parameters, return types, and purposes.\u003c/p\u003e\n"],["\u003cp\u003eThe use of nested *Params classes is introduced to pass arguments in order to avoid breaking derived classes.\u003c/p\u003e\n"]]],[],null,[]]
